The best thing is a high compression head, the second best is a set of dome pistons,
the third best is a set of flat tops (slight dome) with .080 to .125 taken off an early head.
the fourth is .080 to .125 taken off a late model head. (use thick washers under the head bolt if you mill the head) the fifth is flat tops with an early head and lastly flat tops
with a late head.
Oh and you can use the dome piston and take .080 off the head.